Grinding-machine.



A. B. AYER. GBINDING MACHINE. .APPLICATION HLED HAB.. 23, 1908.

Patented Jan. 26, 1909.

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MM' y A. B. AYER. GRINDING MACHINE. l APPLICATION FILED MAR. 2s, 190e.

Patented Jan. 26, 1909.

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lA. E. AYER. GRINDIN G MACHINE. ABPLloATIoN :um MAR. 2a, 190e.

910,984. A 'PanaJan 26,1909.

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ALBERT E. AYER, OF CHELSEA, MASSACHUSETTS, ASSIGNOR TO RUTH L; VOSE, OF

` BROOKLINE, MASSACHUSETTS.

Grammars-MACHINE.

Patented Jan. 26, 1909.

Application filed Marchk23, 1908. Serial No. 422,582.

To alliwhom it may concern: x fr Be it known that I, ALBERT E. AYER, a citizen of the United States, residing in Chelsea, county of Suffolk, and State of Massachusetts, have invented an Improvement in Grinding-Machines, of Which the following description, in connection with the accompanying drawings, is a speciiication, like letters on the drawings representing like parts,

This invention relates to a grindingmachine especially adapted among other uses,

Vto be employed for grinding the knives of a rotary cutter, such as -noW commonly employed for trimming the edges of the soles and heels of boots 4and shoes.

The present invention has for its object to provide a simple and eflicient machine, with which the knives vmay be quickly and accurately ground. For this purpose, the rotary cutter is mounted on a rotatable shaft, supported in bearings in a support or carrier movable across the grinder, and said cutter cooperates with a gage, which is movable with the s'aid carrier or support toward said grinder, so as to back up the cutter while it .is being ground. Provision is made for mov- Fig. 3, an end-elevation of the machine shown in Fig. 1, and Figli, an end elevation showing the rotary cutter in what may be termed its turning position. Y Y

In the present instance, the invention is shown in a machine provided with a grinding disk or wheel a, which is mounted on a shaft t, j ournaled in a yoke csecured to or forming part of an uprightv frame d, which supports the operative parts.V The shaft?) is provided as shown with a pulley e, by means of whichsaid shaft is rotated by a belt (not shown). The grinding Wheel ofl is designed to grind a rotary cutter, such, for instance, as is Vnow commonly employed in trimming the edges .head 10 and secured therein of the soles and heels of boots and shoes, and, in the present instance, one form of such cutter is shown, which comprises a head 10 having a plurality of knives 12 extended from the periphery of the same. The knives 12 may beset into slots in the eriphery of the y screws 13, as herein shown.

The cutter headlO is detachably mounted on a shaft .15 rotatably supported in a substantiallylong bearingl, secured to a carrier or bar 17, Which is movable in a direction substantially 4at right angles to the grinder shaft I). vThe carrier 17 is Vmounted to slide on a support, shown as a bar 18, having a rib 19, upon which said carrier is dovetailed. The bar 18 may be vertically movable,l and as shown is pivoted at 20 to a plate or bar 21, having `extended from it substantially near its center a bar 22, which is mounted to slide in a guideway in the upright frame d. The bar 22 may be adjusted by the thumb-screw 24. The guide bar 18 may be turned on its pivot 20 by manipulating the set screws 25, 26, (see Fig. l) extended through lugs 27, 28, on the plate 21. The cutter carrying shaft 15 is designed to be rotated in its bearing 16 by the operator, and for this purpose, a handle 30 is screwed upon the end 31 of said shaft. Theshaft 15 isfree to be rotated in its bearing 16, but is held from longitudinal movement therein by ,collars 32, 33, which engage the ends of the said bearing, and serve as means for moving the bearing and the carrier 17 toward and away from the grinder, when the operator pushes or pulls upon the handle 30.

Provision is made for positioning the individual cutters orknives With relation to the grinder and for backing up or supporting the said cutters or knives while being ground. For this purpose, I employ a gage which is movable with the carrier 17, yet is capable of being held against movement with the same.

The gage referred to is shown as a thumbscrew 35 adapted to engage a threaded socket in a split boss or hub 36 attached to an arm 37 on a lever 38, which is pivoted at its lower end as at 39 to the front face of the carrier 17. vThe thumb-screw 35 is capable of being turned into or out of the. threaded hub 36 so as to adjust the head of the screw into proper working position with relation to the grinder, and said screw or gage, may then be l is again pushed forward, so as to bring the clamped in its hub and thus secured against accidental movement, by the clamping screw 40, which is extended through the ears 41 on the split hub or boss 36 (see Fig. 3).

The gage lever 38 is normally held in a iixed relation to the carrier 17 by a spring 42 located in a socket in a boss 43 attached to the carrier 17, and normally forcing the said lever against an adjustable back stop 45 movable in a split boss 46 on the said carrier. The back stop 45 is adjustable in the boss 46 and is secu-red in its adjusted position by the clamping screw 47. Normally the lever 3S occupies a substantially vertical position as represented in Fig. 31, with the gage- 35 in the path of rotation. of the knives 12 on the eutter head 10, and by adjusting the gage 35 with relation to the grinder a, the knife engaging the gageis properly positioned with relation to the grinder, so asto cause the desired amount of the front face of the knife to be removed by the grinder, to leave the liront face substantially parallel with the back of the knife and to have all the knives of uniform thickness, and as a result, the cutting edgesof all the knives cut to the same depth in the stock.

When the knife to be ground is in engagement with the gage, as shown in Figs. 1 and 3, the operator pushes upon the handle 30 so as to move the carrier 17 in the direction indicated by the arrow 50, Fig. 3, and therebyY carry the knife up to and beyond the grinder, which removes the front face thereof and leaves the knife with a sharp cutting edge. The carrier 17 is moved so as to preferably carry the knife beyond the grinder, and on this movement of the knife, the latter is held against the gage, by the operator through the handle 30. After one knife` has been ground as described, the operator pulls upon the handle 30 and thus draws the carrier backward or in the direction opposite to that indicated by the arrow 50, and areferably until the said carrier is brought up against a stop or set screw 51 carried by the supporting bar 18. Onthe backward movement of the carrier 17, the gage 35 and its supporting lever 38 are moved with it, for a part of the travel of said carrier, and as herein shown, until the boss 36 engages a iixed stop 55, shown as a lug or projection on the framework of the machine. On the continued backward movement of the carrier 17, the upper part of the lever 38 practically remains stationary, and` the lower part moves with the carrier and assumes substantially the position shown in Fig. 4, in which position, it will be noticed, that the carrier has been moved backward so that the rotary cutter is out of line with the gage 35 and is free to be rotated tobring an unground. knife into position to. engage the gage when the handle 30 parts into their normal or starting position shown in Fig. 3, after which the carrier and gage with the knife held against the gage, is moved forward to bring the knife into cngagement with the grinder, as above described. It will thus be seen that the gage and the carrier are moved forward simultaneously, and that on the backward movement, the carrier is capable of being moved independently of the gage, so as to move tbc knife out of engagement with the gage and `permit the cutter head to be turned and bring an unground knife into operative relation to the gage. In this manner, all the knives are ground uniformly and in the least possible time, with minimum inconvenience to the operator.

Claims- 1, In a machine of the character described, in combination, a rotatable grinder, a rotatable cutter-carrying-shaft arrangedsubstantially at right angles to said grinder and capable of having a cutter attached thereto to rotate therewith, a support for said grinder,

a carrier for said shaft movable toward and from said grinder, a lever pivoted to said earrier, means to hold said lever in a substantially iiXed relation tok said carrier while the latter is moving toward said grinder, a gage carried by said lever and cooperating with said cutter and engaged thereby while said cutter is being ground, and means cooperating with said lever to permit the carrier to be moved independently of the gage to rcmove the cutter from engagement with the said gage and enable it to be rotated, for the purpose speciiied.

2. in a machine of the character*described, in combination, a rotatable grinder, a rotatable eutter-carrying-shaft arranged substantially at right angles to said grinder and capable of having a cutter attached thereto to rotate therewith, a support for said grinder, a carrier for said shaft movable toward and from said grinder, a lever pivoted at its lower end to said carrier, a gage adjustably secured to the free end of said lever, a back stop on the carrier cooperating with said lever, a spring carried by said carrier to normally hold said lever against its back stop, and a stop cooperating with the free end of the said lever, to render the gage stationary and cnable the cutter to be moved out of line therewith, substantially as described.

3. ln a machine of the character described, in combination, a rotatable shaft, a grinding wheel mounted. thereon, a rotatable cuttercarrying-shaft capable of having mounted thereon a cutter head provided with a plurality of knives or cutters, a carrier for said cutter-shaft substantially at right angles to the said grinder shaft, a gage for the cutters normally inthe path of rotation of the saine,

' groer u and movable with the carrier toward the In testimony whereof, I have signed my grinding Wheel to back up the knife being name to this specification in the presence of 10 ground, and means ooperating With said tWo subscribing Witnesses.

gage to permit the carrier to be moved inde- 5 pendently thereof to disengage the ground ALBERT E AYER cutter from said gage and enable an un- Witnesses:

ground cutter to be engaged therewith, sub- JAS. H. CHURCHILL, stantially as described. J. MURPHY. 

